How many atoms of zinc are in 0.60 mol of zinc ?

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: